consulate in benghazi a terrorist attack. elizabeth palmer has been investigating in benghazi. >> reporter: at a solemn memorial service, libya's president paid his respects to ambassador christopher stevens. u.s. deputy secretary of state william bornes had earlier flown into the capital under tight security. behind the scenes, an f.b.i. team is preparing to fly to benghazi to investigate the attack. the compound behind these walls is the major crime scene, but any evidence left inside will have been badly contaminated by the looters and the curious local people who flooded in after the attack. here's what eyewitnesses, officials and libyan commanders in charge that night have told us. sometime around 9:30 p.m., about 70 armed men attacked the consulate's main gates with guns and heavy weapons. they then stormed in, overwhelming local and american security. with all four buildings on fire, the libyan government ordered a local militia to the rescue. that militia helped to ferry 31 americans and the body of sean smith out the